[PATCH] soundwire: SDCA: add helper macro to access controls

[Bard Liao]

From: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>

The upcoming SDCA (SoundWire Device Class Audio) specification defines
a hiearchical encoding to interface with Class-defined capabilities,
based on which audio function, entity, control and channel being used.

The specification is not yet accessible to the general public but this
information is released with explicit permission from the MIPI Board
to avoid delays with SDCA support on Linux platforms.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Reviewed-by: Rander Wang <rander.wang at linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski at linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao at linux.intel.com>
---
 include/linux/soundwire/sdw_registers.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/soundwire/sdw_registers.h b/include/linux/soundwire/sdw_registers.h
index 5d3c271af7d1..3ca09a02b9fc 100644
--- a/include/linux/soundwire/sdw_registers.h
+++ b/include/linux/soundwire/sdw_registers.h
@@ -305,4 +305,14 @@
 #define SDW_CASC_PORT_MASK_INTSTAT3		1
 #define SDW_CASC_PORT_REG_OFFSET_INTSTAT3	2
 
+/* v1.2 device - SDCA address mapping */
+#define SDW_SDCA_CTL(fun, ent, ctl, ch) (BIT(30) |	\
+					 (((fun) & 0x7) << 22) |	\
+					 (((ent) & 0x40) << 15) |	\
+					 (((ent) & 0x3f) << 7) |	\
+					 (((ctl) & 0x30) << 15) |	\
+					 (((ctl) & 0x0f) << 3) |	\
+					 (((ch) & 0x38) << 12) |	\
+					 ((ch) & 0x07))
+
 #endif /* __SDW_REGISTERS_H */
-- 
2.17.1